BLANCHE [singing blithely]: Say, it’s only a paper moon, Sailing over a cardboard sea – But it wouldn’t be make-believe If you believed in me!
– Tennessee Williams
A Streetcar Named Desire, Scene 7. While taking a bath Blanche is described as "blithely" singing a song about love and fantasy. This means she is singing in a cheerful and carefree manner, creating dramatic irony. For Blanche doesn’t know that her world of fantasy is at that moment being shattered by Stanley who is telling Stella all about her sordid past.